ALESIS RA 500 AMP https://www.alesis.com/products/legacy/ra500 THIS AMP IS DEVOID OF NOISE BECAUSE THERE IS NO NEED FOR FAN COOLING AND IS OPTIMALLY USED IN HOME THEATER AND STUDIO. BGW 250B THESE AMPS ARE VIRTUALLY INDESTRUCTIBLE https://www.canuckaudiomart.com/details/649438612-bgw-250b/ IVE HAD NO PROBLEMS WITH THESE AMPS AND USED THEM IN MY JAM SPACE TO POWER 4 LARGE MONITORS WITH POWER TO SPARE. ALL EQUIPMENT IS IN EXCELLENT SHAPE. GREAT ADDITION TO YOUR RECORDING STUDIO OR HOME THEATRE SYSTEM. I MAY CONSIDER SELLING ITEMS SEPARATELY. NO REASONABLE OFFER REFUSED. PHONE KEVIN AT 778-350-2390